#include <stdio.h>
#define MAX(a, b) (a > b) ? a : b //带参数的宏定义

int main(void)
{
    int x, y, max;
    printf("input tow numbers: ");
    scanf("%d%d", &x, &y);
    max = MAX(x, y);
    printf("max = %d\n", max);
    return 0;
}